CN116290104A - A construction method for underwater section-by-section installation of an anchored floating tunnel - Google Patents

Abstract

The invention discloses a section-by-section underwater installation method of an anchored floating tunnel, comprising: step 1, transporting the section of the floating tunnel to be installed to the shore structure; step 2, moving the section of the floating tunnel to be installed into the outfitting In the installation trolley in the installation room; Step 3, first fix the pipe joint of the floating tunnel to be installed on the installation trolley, fill the outfitting room with water and adjust the buoyant weight ratio of the installation trolley and the pipe joint of the floating tunnel to be installed; Step 4, The installation trolley runs to the suspension tunnel pipe section that has been installed in the previous section, and then pauses; step 5, the rear outrigger of the installation trolley continues to move forward, but keeps the front outrigger still, and puts the suspension tunnel pipe section to be installed Send to the installation location; Step 6, connect the suspension tunnel pipe section to be installed with the suspension tunnel pipe section that has been installed in the previous section; Step 7, return the installation trolley to the outfitting room; Step 8, repeat steps 1 to 7, Carry out the installation of the pipe joints of the subsequent section of the floating tunnel. The invention is safer, more efficient and more economical.

Description

A construction method for underwater section-by-section installation of an anchored floating tunnel

technical field

The invention relates to a construction method for underwater installation of an anchored floating tunnel section by section.

Background technique

The submerged floating tunnel, the English name is "Submerged Floating Tunnel", referred to as "SFT". In Italy, it is also called "Archimedes bridge", or "PDA" bridge for short. Generally, it consists of a tubular structure floating at a certain depth in the water (the space of the structure is large enough to meet the requirements of road and railway traffic), a support system (anchor cables anchored on the seabed foundation, pier columns or buoys on the water) and connected with it. Composition of structures on both sides of the strait. It is a new type of structure that means of transportation across the two banks separated by deep water. It is suitable for all means of transportation that need to pass through the water. It can pass trains, cars, small motor vehicles and pedestrians, and can also be made to pass through various service channels for pipes and cables. The difference between floating tunnels in water and traditional buried tunnels or excavated tunnels is that the floating tunnel structure is surrounded by water, neither on the ground nor through the ground, but mainly depends on the gravity of its own structure, the buoyancy of the structure and the support The anchoring force of the system is used to keep it in a fixed position. The suspension tunnel is sealed all around, and this structure has all the characteristics of ordinary tunnels, and should be considered as a "tunnel" rather than a "bridge" from the point of view of use.

Suspension tunnels can pass through different waters, such as rivers, fjords, straits, lakes, etc., and provide possible and acceptable fixed spanning structures for those places that cannot be crossed due to consideration of deep water or too large distance between banks. The floating tunnel is built at a certain depth underwater. Compared with open channels and ferry transportation on the water surface, severe wind, waves, fog, rain, snow and other weather will not affect the all-weather operation of the floating tunnel. Under the premise of ensuring the same navigation capacity, compared with the bridge, the slope of the floating tunnel is relatively gentle and the total length is also reduced. The construction process and the use of the floating tunnel will not affect the environment and natural landscape; when it exceeds a certain span and water depth, the unit cost of the suspension tunnel will not increase significantly with the increase of the span channel length or water channel depth, while the unit cost of the cable-stayed bridge and suspension bridge will increase significantly with the increase of the span.

Although floating tunnels have certain advantages over sea-crossing passages such as immersed tunnels, deep-buried tunnels, and bridges, the design and construction of floating tunnels are still a worldwide problem, and no floating tunnels have been built yet. At present, there are mainly 7 countries (Norway, Italy, Japan, China, Switzerland, Brazil, and the United States) in the world doing research, and many technical problems found in the research mainly include: overall structural layout, tunnel materials, structural types of anchorage systems, and tunnel structures. Connection type and shore structure design, tunnel structure feasibility, construction and operation risks, etc. Whether these problems can be solved determines whether the floating tunnel can move from a feasible solution to an actual project.

So far, in the study of floating tunnels, according to the relationship between the gravity of the floating tunnel and the buoyancy, the proposed structural types can be roughly divided into three categories: buoy type, anchor type, and pier type. The buoy-type floating tunnel is suspended on the buoy on the water surface through anchor cables or anchor chains. The gravity of the tunnel is greater than the buoyancy, and the vertical direction is greatly affected by the fluctuation of the tide level; On the anchorage foundation below the bed, the gravity of the tunnel is less than the buoyancy, and the tunnel will displace or shake under the action of hydrodynamic forces; the pier-column type is actually a tunnel bridge supported on underwater pier columns, which is difficult and expensive to construct.

At present, long-term research has been carried out on the anchored floating tunnel structure at home and abroad. It consists of an underwater floating tunnel body, a shore structure, an anchoring system, a buoyant weight ratio adjustment system, and tunnel auxiliary facilities. Cable anchors are set on the tunnel pipe section and fixed on the seabed through the anchor foundation. Both ends of the pipe section are connected to the shore structure, and connected to the ground road through the land slope tunnel.

Because the floating tunnel is located at a deep underwater position, the three types of floating tunnels are very difficult in pipe joint transportation, underwater positioning, and underwater or underwater installation and docking construction, and the safety risks are also high, and there is no mature construction that has been successfully implemented. technology. At present, the technologies that can be used for reference in the installation and construction of floating tunnels are the installation of immersed tube tunnels floating on water, sinking on water, and barge sinking. This process is greatly affected by wind, waves, currents, and ship waves. Floating installation has only one window period per month, and the channel needs to be closed during the floating of pipe joints, which has a great impact on water traffic, high construction costs, and greater safety risks.

In order to fill the gap in the underwater section-by-section installation technology of floating tunnel pipes, a construction method for underwater section-by-section installation of anchored floating tunnels is proposed, which makes the installation of floating tunnels a safer, more efficient and economical construction plan. , will make the floating tunnel from ideal to reality as soon as possible.

Contents of the invention

The purpose of the present invention is to fill the blank of the prior art in the section-by-section installation of floating tunnel pipes under water saving, and proposes a construction method for underwater section-by-section installation of anchored suspension tunnels, which makes the installation of floating tunnels more secure. An efficient, efficient and economical construction plan will make the floating tunnel turn from ideal into reality as soon as possible.

The object of the present invention is achieved like this: a kind of construction method of anchor type suspension tunnel underwater section-by-section installation, comprises the following steps:

Step 1. Firstly, the prefabricated floating tunnel pipe joints to be installed on land are transported to the shore structure through the land slope tunnel; the shore structure includes a jacking room on the backwater side and an outfitting room on the upstream side. The outfitting room is equipped with installation trolleys, and the outfitting room is provided with entrances and exits;

Step 2, in the jacking room of the shore structure, the pipe joints of the floating tunnel to be installed are loaded into the installation trolley through vertical movement and lateral movement in sequence;

Step 3: First, place a pair of front lugs and a pair of rear lugs on the upper part of the suspension tunnel pipe section to be installed in one-to-one correspondence with a pair of front pipe sections on the installation trolley to lower the wire rope of the hoist and a pair of rear pipes. Then, close the entrance of the outfitting room and the outlet of the outfitting room in the docking structure, and then inject water into the outfitting room, and at the same time adjust the buoyant weight ratio of the installation trolley and the pipe section of the floating tunnel to be installed The buoyant weight ratio of the floating tunnel to be installed makes the buoyant weight ratio of the floating tunnel pipe section to be installed less than 1, and the floating weight ratio of the installation trolley is greater than 1, and the overall buoyant weight ratio of the installation trolley and the floating tunnel pipe section to be installed is greater than 1;

Step 4: Open the exit of the outfitting room first, then control the installation trolley to run to the suspended tunnel pipe section installed in the previous section, and then stop moving forward, and arrange a pair of Temporary mooring piers, and the cables on the pair of trolley mooring hoists installed on the trolley are connected to the pair of temporary mooring piers in a figure-eight shape;

Step five, control the installation trolley to continue to move forward. During this process, the front legs of the installation trolley are still. By adjusting the length and tension of the two cables, the position of the installation trolley is controlled until the suspension tunnel pipe to be installed sent to the installation location;

Step 6: Adjust the height and levelness of the floating tunnel pipe joints to be installed by installing a pair of front pipe joint sinking winches and a pair of rear pipe joint sinking winches on the trolley, and adjust the height and level of the suspension tunnel pipe joints to be installed by adjusting the front and rear positions of the installation trolley. The front and rear positions of the installed floating tunnel pipe joints ensure that the floating tunnel pipe joints to be installed can be docked with the previously installed floating tunnel pipe joints;

Step 7, first control the installation trolley to return to the outfitting room, then close the outlet of the outfitting room, and then drain the water in the outfitting room to form a dry construction condition;

Step 8: Repeat steps 1 to 7 to install the pipe joints of the subsequent section of the floating tunnel to the pipe section of the last section of the floating tunnel.

The above-mentioned construction method for underwater installation of the anchored floating tunnel section by section, wherein the bank-connecting structure is arranged on the bank slope and includes an indoor part and an outdoor part; wherein,

The indoor part is provided with the jacking room, the partition wall and the outfitting room sequentially from the land area to the sea area; the bottom of the jacking room is equipped with a jacking device, and the rear end of the jacking room is the The backwater side wall, the lower part of the backwater side wall is provided with an opening communicating with the tunnel of the land slope section; the front end of the outfitting room is the facing water side wall of the indoor part, and the lower part of the outfitting room is provided with a connecting section tunnel. The rear port of the connecting section tunnel communicates with the jacking room; the entrance of the outfitting room is opened directly above the partition wall at the rear port of the connecting section tunnel, and the entrance of the outfitting room is sealed by the inlet end The door is blocked; the outlet of the outfitting room is set on the water-facing side wall and is located directly above the front port of the tunnel of the connecting section, and the outlet of the outfitting room is sealed with an outlet-end sealing door; the outlet Install the water supply and drainage system between the outfitting room and the external water body;

The outdoor part includes a starting section tunnel and a slope protection that are sequentially connected to the front port of the connecting section tunnel; the front end of the starting section tunnel is docked with the rear end of the floating tunnel pipe section, and the starting section tunnel is connected to the connecting section tunnel. Steel seal doors are installed at the joints and the joints between the initial tunnel and the suspension tunnel pipe joints; the two ends of the suspension tunnel pipe joints are sealed with steel seal doors;

A pair of rails are installed on the top surface of the connecting section tunnel and the top surface of the starting section tunnel, and the pair of rails correspond to the pair of rails set on the top surface of the floating tunnel pipe section; the outfitting A pair of track groove sealing devices corresponding to a pair of tracks are arranged at the bottom of the outlet of the chamber.

The above-mentioned construction method for underwater installation of anchored floating tunnels section by section, wherein, the sealing door at the inlet end is a steel plate structure; the sealing door at the outlet end is a reinforced concrete caisson structure with multiple compartments; the sealing door at the outlet end is composed of a bottom plate The caisson shell is composed of the surrounding side walls, and the caisson shell is divided into multiple compartments by several transverse partition walls and several longitudinal partition walls. Several through holes are set at intervals along the height direction on the transverse partition walls and longitudinal partition walls. Install a connecting valve; the top elevation of the sealing door at the outlet end is 2-3m higher than the highest water level of the external water body + wave height + margin height, and the width of the sealing door at the outlet end is the width of the outlet of the outfitting room + at least 8m. The thickness of the end seal door shall meet the requirements of installation, removal and the stability of the base.

The above-mentioned construction method for underwater installation of the anchored floating tunnel section by section, wherein the track groove sealing device includes a steel shell for accommodating the track, a pair of hydraulic jacks and a pair of steel piston heads; the steel shell is embedded in In the water-facing side wall; a pair of hydraulic jacks are installed horizontally and symmetrically on both sides of the steel shell; a pair of steel piston heads are symmetrically installed on the piston rods of a pair of hydraulic jacks, and a pair of steel piston heads Cavities matching the side shapes of the rails are provided on the front end faces, and rubber waterstop strips are provided on the surfaces of the cavities.

The above-mentioned construction method for underwater installation of the anchored floating tunnel section by section, wherein the installation trolley includes a vehicle frame, a front outrigger, a rear outrigger, a front pontoon and a rear pontoon; wherein,

The vehicle frame is a planar truss structure and includes a pair of longitudinal beams, front beams and rear beams; track grooves are provided on the bottom surfaces of the middle and front parts of the pair of longitudinal beams;

The front outrigger is U-shaped and the top is provided with a pair of top rollers, and the bottom of the front outrigger is provided with a pair of front bottom rollers with driving device, so that the front outriggers are reversed one by one through the pair of top rollers. The track grooves on the bottom surface of a pair of longitudinal beams of the vehicle frame, and the front legs are snapped onto the pair of tracks one by one through a pair of front bottom rollers;

The rear outriggers are fixed on the rear of a pair of longitudinal beams of the vehicle frame, and the bottom of the rear outriggers is provided with two pairs of rear bottom rollers with driving devices, so that the rear outriggers pass through the two pairs of rear bottom rollers one by one. Correspondingly clamped on a pair of rails;

The front pontoon is fixed on the front part of the vehicle frame, and a buoyant weight ratio adjustment system is arranged in the front pontoon, and a pair of the front pipe joint sinking and unloading winches and a pair of trolley mooring winches are also installed on the front. inside the pontoon;

The rear pontoon is fixed on the rear of the vehicle frame, and a buoyant weight ratio adjustment system is arranged in the rear pontoon, and a pair of hoists for sinking and releasing the rear pipe joints are also installed in the rear pontoon.

The above-mentioned construction method for underwater installation of anchored floating tunnels section by section, wherein, the rear legs of the installation trolley include two parallel plane trusses, and each plane truss includes a front column, a rear column and a lower Longitudinal beams, two bottom rollers with driving devices are respectively installed on the bottom surface of the lower longitudinal beams of the two plane trusses, and the front and rear columns of the two plane trusses are fixed on a pair of the vehicle frame correspondingly. on the rear underside of the stringer.

The above-mentioned construction method for underwater installation of the anchored floating tunnel section by section, wherein, the rear buoyancy tank of the installation trolley is also provided with an operation room and an oxygen supply device;

The above-mentioned construction method for underwater installation of an anchored floating tunnel section by section, wherein the temporary mooring pier is a deepwater jacket + anchor cable structure.

The construction method of the anchored floating tunnel installed section by section under water of the present invention has the following characteristics:

(1) The construction method of the present invention adopts the underwater transportation of the floating tunnel pipe joints, which greatly reduces the influence of wind, waves and currents on the pipe joint transportation and greatly increases the transportation cost During the window period, transportation efficiency and safety have been improved. For the marine environment, the deeper the water depth, the smaller the current velocity, and the less affected by wind and waves.

(2) The construction method of the present invention adopts the installation trolley and utilizes the installed floating tunnel pipe section to sink the floating tunnel pipe section underwater, compared with the floating tunnel pipe section adopting water sinking barge installation, greatly reduces the The impact of wind, waves and currents on the placement and docking of the floating tunnel pipe joints can effectively avoid the pendulum effect, greatly increasing the laying accuracy of the floating tunnel pipe joints and improving installation efficiency, safety and accuracy.

(3) In the construction method of the present invention, the frequency of using water surface construction ships is low, and basically does not require large-scale ship machinery, the construction has little impact on the passage of water surface ships, and the safety risk of sea traffic is also greatly reduced.

(4) The construction method of the present invention greatly increases the installation window period, greatly shortens the construction period, and effectively reduces construction costs.

Description of drawings

Fig. 1 is a side view of the shore structure involved in step 1 in the construction method of the anchored floating tunnel underwater installation section by section of the present invention;

Fig. 2 a is the cross-sectional view of the outlet sealing door in the shore structure of the present invention;

Fig. 2b is the plane view of the outlet end airtight door in the landing structure of the present invention;

Fig. 3 a is the cross-sectional view (closed state) of the track groove sealing device in the land connection structure of the present invention;

Fig. 3 b is a cross-sectional view (open state) of the track groove sealing device in the land connection structure of the present invention;

Fig. 4a is a side view of the installation trolley involved in step 2 in the construction method of the anchored floating tunnel underwater installation section by section of the present invention;

Figure 4b is a front view of the installation trolley;

Fig. 5 is a state diagram of step 1 in the construction method of the anchored floating tunnel installed section by section under water of the present invention;

Fig. 6 is a kind of state diagram when carrying out step 2 in the construction method of the underwater anchored floating tunnel of the present invention installed section by section;

Fig. 7 is another state diagram when step 2 is carried out in the construction method of the anchored floating tunnel installed section by section under water of the present invention;

Fig. 8 is a state diagram when performing step three in the construction method of the anchored floating tunnel installed section by section under water of the present invention;

Fig. 9 is a state diagram when performing step 4 in the construction method of the anchored floating tunnel installed section by section under water of the present invention;

Fig. 10 is another state diagram when step 4 is carried out in the construction method of the anchored floating tunnel installed section by section under water of the present invention;

Fig. 11 is a state diagram when step five is performed in the construction method of the anchored floating tunnel installed section by section under water of the present invention;

Fig. 12 is a state diagram when performing step 6 in the construction method of the anchored floating tunnel installed section by section under water of the present invention;

Fig. 13 is a state diagram when performing step seven in the construction method of the anchored floating tunnel installed section by section under water of the present invention;

Fig. 14 is a structural schematic diagram of the complete penetration of the floating tunnel after completing the construction method of underwater section-by-section installation of the anchored floating tunnel of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

Please refer to Fig. 1 to Fig. 14, the construction method of the underwater anchored floating tunnel of the present invention is installed section by section, comprising the following steps:

Step 1: First, transport the suspension tunnel pipe section 1' prefabricated on land to be installed through the land slope tunnel 2 to the shore structure 3 (see Fig. 5). The shore structure 3 is set on the bank slope and includes indoor part and outdoor part; among them,

Indoor part and outdoor part, jacking device 9 , a pair of rails 8 , a pair of rail groove sealing devices 8A and a water supply and drainage system 10 .

The indoor part is surrounded by the back water side wall 3A, the front water side wall 3B and the left and right outer walls of the impermeable ground wall structure; the indoor part is provided with a jacking room 31, a partition wall 30 and an outfitting room in sequence from the land area to the sea area 32; where,

The length and width of the jacking chamber 31 should be designed according to the length and diameter of the suspension tunnel pipe section 1; The entrance; the land slope section tunnel 2 is the connection tunnel between the jacking chamber 31 and the ground road;

The length and width of the outfitting room 32 should be designed according to the length and diameter of the pipe section 1 of the floating tunnel and the size of the installation trolley 13, with a certain margin. The front end of the outfitting room 32 is the water-facing side wall 3B, and the lower part of the outfitting room 32 is provided with a connecting section tunnel 5, and the rear port of the connecting section tunnel 5 communicates with the jacking room 31; the inner diameter of the connecting section tunnel 5 is in line with the suspension The inner diameter of the tunnel pipe section 1 is the same;

The partition wall 30 is provided with the entrance of the outfitting room directly above the rear port of the tunnel 5 in the connecting section, and the entrance of the outfitting room is provided with a steel door frame and a rubber waterstop strip, and the entrance of the outfitting room is sealed with an inlet-end sealing door 11; The sealing door 11 at the inlet end is a steel plate door structure, and rubber waterstop strips are arranged around it to prevent water leakage when the door is closed; the size of the sealing door 11 at the inlet end is designed according to the diameter of the pipe joint 1 of the suspension tunnel, and a certain margin is left;

The water-facing side wall 3B is provided with an outlet of the outfitting room directly above the front port of the tunnel 5 in the connecting section. The outlet of the outfitting room is provided with a steel door frame and rubber waterstop strips. The outlet of the outfitting room adopts an outlet-end sealed door 12 blockage.

The outlet sealing door 12 is a reinforced concrete caisson structure with multiple compartments; the outlet sealing door 12 is composed of a bottom plate 120 and surrounding side walls 121 to form a caisson shell, and the inside of the caisson shell is divided into multiple compartments by several transverse partition walls 122 and several longitudinal partition walls 123. In the compartment, the transverse partition wall 122 and the longitudinal partition wall 123 are provided with several through holes at intervals along the height direction, and a communication valve 124 is installed in each through hole (see Fig. 2a and Fig. 2b); The liquid level of each compartment in the caisson. The sinking or floating of the sealing door 12 at the outlet end is realized by injecting water and draining water into a plurality of compartments, and the sealing door 12 at the outlet end is moved, positioned and installed by the tugboat after floating. When injecting water into the caisson cannot meet the stability requirements, the self-weight of the outlet-end sealing door 12 can also be increased by backfilling sand and gravel into the caisson; the top elevation of the outlet-end sealing door 12 should be higher than the highest water level + wave Height + surplus height 2-3m, the width of the exit-end sealing door 12 is the width of the exit of the outfitting room + at least 8m, that is, the width of the exit-end sealing door 12 should be at least 4m wider than the two sides of the exit of the outfitting room, The thickness of the outlet-port hermetic door 12 will meet the requirements for installation, removal and stability of the base.

The outdoor part includes the starting section tunnel 6 and the slope protection 7 connected in sequence to the front port of the connecting section tunnel 5; wherein,

The inner diameter of the tunnel 6 in the starting section is the same as that of the pipe section 1 of the floating tunnel. The tunnel 6 in the starting section adopts a reinforced concrete structure and is prefabricated before installation; Steel sealing doors are set at the joints of the section tunnel 6 and the connecting section tunnel 5 and at the joints of the starting section tunnel 6 and the suspension tunnel pipe section 1;

The jacking device 9 is installed at the bottom of the jacking chamber 31; the jacking device 9 includes several jacks and steel structure jacking beams installed on the several jacks.

A pair of rails 8 are installed on the top surface of the connecting section tunnel 5 and the top surface of the starting section tunnel 6, and the pair of rails 8 correspond to the pair of rails arranged on the top surface of the pipe section 1 of each floating tunnel; The cross section of the track 8 is I-shaped.

A pair of rail groove sealing devices 8A and a pair of rails 8 are arranged at the bottom of the outlet of the outfitting room in one-to-one correspondence; the rail groove sealing devices 8A are used to block the gaps on both sides of the rail 8 and together with the outlet end sealing door 12 are The outfitting room 32 forms a sealed water-retaining system to prevent water outside the interior from entering the outfitting room 32 .

The track groove sealing device 8A comprises a steel shell 80, a pair of hydraulic jacks 82 and a pair of steel piston heads 153 (see Fig. 3a and Fig. 3b); The vertical plates on both sides and the left top plate and the right top plate connected to the top of the two vertical plates one by one correspond to each other, so that the top of the steel shell 80 has a gap with a width greater than the cross-sectional width of the track 8, and the bottom surface of the steel shell 80 and the outer surfaces of the two vertical plates, the outer surface of the left top plate and the outer surface of the right top plate are all welded with some anchor ribs 81, so that the steel shell 80 is fixed in the water-facing side wall through the anchor bars; the track 8 is fixed on the steel shell 80 The middle part of the bottom plate; a pair of hydraulic jacks 82 are symmetrically installed in the middle of the inner surface of the two vertical plates of the steel shell 80; a pair of steel piston heads 83 are symmetrically installed on the piston rods of the pair of hydraulic jacks 82, the pair of steel The top surface of the piston head 83 is in movable sealing contact with the bottom surface of the left top plate of the steel housing 80 and the bottom surface of the right top plate one by one, and the bottom surface of the pair of steel piston heads 83 and the top surface of the bottom surface of the steel housing 80 are movable. Sealed contact, the front end faces of the pair of steel piston heads 83 are provided with a mold cavity that matches the side shape of the track 8, and a rubber waterstop strip 84 is installed on the surface of the cavity to ensure the waterstop effect;

The water supply and drainage system 10 is set between the outfitting room 32 and the external water body; the water supply and drainage system 10 includes a high-power, high-lift water pump set in the outfitting room 32 and connected to the water outlet of the water pump and leading to the water-facing side wall 3B The water pipe in the water body on the front side is used to pump out the water in the outfitting room 32 by the water pump, or inject water into the outfitting room 32 through the water supply pipe, so as to realize the dry-wet conversion function of the outfitting room 32 .

Step 2: In the jacking chamber 31 under the anhydrous environment of the shore structure 3, the floating tunnel pipe section 1' to be installed is first lifted by the jack of the jacking device 9 to complete the vertical movement (see Figure 6), and then Insert the carrying airbag between the floating tunnel pipe section 1' to be installed and the jacking beam of the jacking device 9, and move the floating tunnel pipe section 1' to be installed horizontally forward to the outfitting room 32 after the airbag is inflated. In the installation trolley 4 on a pair of rails 8 on the connection section tunnel 6 top surface in the interior (see Fig. 7); 43 and rear pontoon 44 (seeing Fig. 4a and Fig. 4b); Wherein,

The vehicle frame 40 is a planar truss structure and includes a pair of longitudinal beams, front beams and rear beams; track grooves are provided on the bottom surfaces of the middle and front parts of the pair of longitudinal beams;

The front leg 41 is U-shaped and the top is provided with a pair of top rollers 4A, and the bottom of the front leg 41 is provided with a pair of front bottom rollers 4B with a driving device, so that the front legs 41 correspond one-to-one through the pair of top rollers 4A. The ground is buckled upside down in the track grooves on the bottom surface of a pair of longitudinal beams of the vehicle frame, and the front legs 41 are snapped onto the pair of tracks 8 one by one through a pair of front bottom rollers 4B;

Rear supporting leg 42 is fixed on the rear portion of a pair of longitudinal beams of vehicle frame 40, and rear supporting leg 42 comprises two planar trusses arranged in parallel, and each planar truss all comprises front column, rear column and a lower longitudinal beam, two Two rear bottom rollers 4C with driving devices are respectively installed correspondingly on the bottom surface of the lower longitudinal beam of the planar truss, and the front and rear columns of the two planar trusses are fixed on a pair of longitudinal beams of the vehicle frame 40 one by one. On the bottom surface of the rear part, the rear legs 42 are snapped onto a pair of rails 8 in a one-to-one correspondence through two pairs of rear bottom rollers 4C;

The front buoyancy box 43 is fixed on the front part of the vehicle frame 40, and the front buoyancy box 43 is provided with a buoyant weight ratio adjustment system 45, a pair of front pipe joint sinking and unloading winches 46 and a pair of trolley mooring winches 47;

The rear pontoon 44 is fixed on the rear of the vehicle frame 40, and the rear pontoon 44 is provided with a buoyant weight ratio adjustment system 45, a pair of rear pipe joint sinking hoists 48, an operating room 49 and an oxygen supply device; the buoyant weight ratio adjustment System 45 includes a water tank and a pumping and draining pipeline;

Step 3: Firstly, the pair of front lifting lugs and the pair of rear lifting lugs on the upper part of the suspension tunnel pipe section 1' to be installed are respectively connected to the pair of front pipe sections on the installation trolley 4 one by one through the shackles, and the hoist is lowered. 46 steel wire rope is connected with the steel wire rope of a pair of rear pipe joint sinking hoist 48, then closes the inlet end sealing door 11, a pair of track groove sealing device 8A (see Figure 8) and the outlet end sealing door 12, and then passes through the water supply and drainage system 10 Inject water into the outfitting room 32, and at the same time, through the buoyant weight ratio adjustment system 45 installed on the installation trolley 4 and the buoyant weight ratio adjustment system in the floating tunnel pipe section 1' to be installed, respectively adjust the floating tunnel tube to be installed. The buoyant weight ratio of section 1' and the buoyant weight ratio of installation trolley 4 make the buoyant weight ratio of floating tunnel pipe section 1' to be installed slightly less than 1, and make the buoyant weight ratio of installation trolley 4 slightly greater than 1. The overall buoyancy ratio of the trolley 4 and the floating tunnel section 1' to be installed is slightly greater than 1, so as to ensure that the buoyancy of the floating tunnel section 1' to be installed is slightly smaller than gravity, so that the floating tunnel section 1' to be installed is in the It is not necessary to provide additional vertical load during the installation and diving process, and at the same time, it is ensured that the installation trolley 4 always maintains buoyancy greater than gravity and does not sink during the process of driving and installing pipe joints;

Step 4, firstly open the outlet end sealing door 12 and a pair of track groove sealing devices 8A (see Figure 9), and then control the installation trolley 4 to run along a pair of tracks 8 to the floating tunnel pipe section 1 (starting Section tunnel 6) pauses after going up, and arranges a pair of temporary mooring piers 13 symmetrically along both sides of the suspension tunnel axis in front of the installation trolley 4, and moors the winch 47 of a pair of trolleys on the installation trolley 4. The cables 130 on the top are connected to the pair of temporary mooring piers 13 in a figure-eight shape (see Figure 10); to prevent the position of the installation trolley 4 due to the action of water flow when the cantilever advances and during the pipe joint installation process. Deviation occurs; the temporary mooring pier 13 is a deepwater jacket + anchor cable structure, which can realize the function of turnover. When the floating tunnel pipe section 1 is installed and pushed forward for a certain distance, the angle of the two cables 130 cannot meet the requirements of the installation platform. When the stability requirement of car 4, can pull up temporary mooring pier 13 and reinstall again;

Step 5, control the two pairs of rear bottom rollers 4C of the installation trolley 4 to continue to move forward. During this process, a pair of front bottom rollers 4B of the installation trolley 4 are stationary, and the installation is controlled by adjusting the length and tension of the two cables 130. The front and rear positions of the trolley 4, until the floating tunnel pipe joint 1' to be installed is sent to the installation position (see Figure 11);

Since the overall buoyant weight ratio of the installation trolley 4 and the floating tunnel pipe section 1 is close to 1, the vertical load generated by the installed floating tunnel pipe section 1 is very small. It can ensure the stability and safety of the installed floating tunnel pipe section 1;

Step 6, adjust the height and levelness of the floating tunnel pipe section 1' to be installed by installing a pair of front pipe joint sinking and unwinding winches 46 and a pair of rear pipe joint sinking and unwinding hoists 48 on the trolley 4, and adjust the installation trolley 4, adjust the front and rear positions of the floating tunnel pipe section 1' to be installed, and at the same time, install a pulling device on the floating tunnel pipe section 1 (starting section tunnel 6) that has been installed in the previous section to control the floating tunnel pipe section to be installed 1' to ensure that the floating tunnel pipe section 1' to be installed can be accurately docked and installed with the starting section tunnel 6 (installed floating tunnel pipe section 1), and then a pair of front pipe sections are lowered into the hoist 46 and a Decoupling the hoist 48 after sinking and unwinding the pipe section from the floating tunnel pipe section 1' to be installed, and finally connecting the anchor chain 1A on the docked floating tunnel pipe section 1' to the anchor foundation fixed on the seabed (see Figure 12);

Step 7: After the installation of the floating tunnel pipe section 1' to be installed is completed, first control the installation trolley 4 to return to the outfitting room 32, close the outlet sealing door 12 and the track groove sealing device 8A, and seal the outfitting room through the water supply and drainage system 10. The water in 32 drains and forms dry construction condition (seeing figure 13);

Step 8: Repeat steps 1 to 7 to install the subsequent floating tunnel pipe joints to the last floating tunnel pipe joints. After all the floating tunnel pipe joints 1 are installed, the installation trolley 4 is removed, and the exit of the outfitting room adopts The cast-in-place reinforced concrete is sealed, and the construction of the cast-in-place reinforced concrete tunnel section 3C is completed in the lower part of the jacking chamber 31 (see FIG. 14 ), so as to realize the complete penetration of the floating tunnel.

The construction method of the anchored floating tunnel underwater installation section by section of the present invention is all controlled in the operating room 49 on the installation trolley 4, and the operating room 49 monitors the installation platform through pressure sensing, inclinometer and video mode. The attitude and the stress situation of the car 4 are monitored, and a pair of front pipe joint sinking winches 46, a pair of rear pipe joint sinking winches 48 and a pair of trolley mooring winches 47 to be installed are controlled to be installed on the trolley 4. The attitude of the pipe section 1' of the suspended tunnel is controlled, and the buoyant weight ratio of the entire installation trolley 4 is controlled through the buoyant weight ratio adjustment system 45, so that the installation trolley 4 is balanced under water.

The above embodiments are only for the purpose of illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can also make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent The technical solutions should also belong to the category of the present invention and should be defined by each claim.

Claims (8)

1. A construction method for underwater installation of an anchored floating tunnel joint by joint, characterized in that, comprising the following steps: Step 1. Firstly, the prefabricated floating tunnel pipe joints to be installed on land are transported to the shore structure through the land slope tunnel; the shore structure includes a jacking room on the backwater side and an outfitting room on the upstream side. The outfitting room is equipped with installation trolleys, and the outfitting room is provided with entrances and exits; Step 2, in the jacking room of the shore structure, the pipe joints of the floating tunnel to be installed are loaded into the installation trolley through vertical movement and lateral movement in sequence; Step 3: First, place a pair of front lugs and a pair of rear lugs on the upper part of the floating tunnel pipe section to be installed in one-to-one correspondence with a pair of front pipe sections on the installation trolley to sink the wire rope of the hoist and a pair of rear pipes. Then, close the entrance of the outfitting room and the outlet of the outfitting room in the docking structure, and then fill the outfitting room with water, and at the same time adjust the buoyant weight ratio of the installation trolley and the pipe section of the floating tunnel to be installed The buoyant weight ratio of the floating tunnel to be installed makes the buoyant weight ratio of the floating tunnel pipe section to be installed less than 1, and the floating weight ratio of the installation trolley is greater than 1, and the overall buoyant weight ratio of the installation trolley and the floating tunnel pipe section to be installed is greater than 1; Step 4: Open the exit of the outfitting room first, then control the installation trolley to run to the suspended tunnel pipe section installed in the previous section, and then stop moving forward, and arrange a pair of Temporary mooring piers, and the cables on the pair of trolley mooring hoists installed on the trolley are connected to the pair of temporary mooring piers in a figure-eight shape; Step five, control the installation trolley to continue to move forward. During this process, the front legs of the installation trolley are still. By adjusting the length and tension of the two cables, the position of the installation trolley is controlled until the suspension tunnel pipe to be installed sent to the installation location; Step 6: Adjust the height and levelness of the floating tunnel pipe joints to be installed by installing a pair of front pipe joint sinking winches and a pair of rear pipe joint sinking winches on the trolley, and adjust the height and level of the suspension tunnel pipe joints to be installed by adjusting the front and rear positions of the installation trolley. The front and rear positions of the installed floating tunnel pipe joints ensure that the floating tunnel pipe joints to be installed can be docked with the previously installed floating tunnel pipe joints; Step 7, first control the installation trolley to return to the outfitting room, then close the outlet of the outfitting room, and then drain the water in the outfitting room to form a dry construction condition; Step 8: Repeat steps 1 to 7 to install the pipe joints of the subsequent section of the floating tunnel to the pipe section of the last section of the floating tunnel. 2. The construction method for installing the anchored floating tunnel underwater section by section according to claim 1, wherein the shore structure is arranged on the bank slope and includes an indoor part and an outdoor part; wherein, The indoor part is provided with the jacking room, the partition wall and the outfitting room sequentially from the land area to the sea area; the bottom of the jacking room is equipped with a jacking device, and the rear end of the jacking room is the The backwater side wall, the lower part of the backwater side wall is provided with an opening communicating with the tunnel of the land slope section; the front end of the outfitting room is the facing water side wall of the indoor part, and the lower part of the outfitting room is provided with a connecting section tunnel. The rear port of the connecting section tunnel communicates with the jacking room; the entrance of the outfitting room is opened directly above the partition wall at the rear port of the connecting section tunnel, and the entrance of the outfitting room is sealed by the inlet end The door is blocked; the outlet of the outfitting room is set on the water-facing side wall and is located directly above the front port of the tunnel of the connecting section, and the outlet of the outfitting room is sealed with an outlet-end sealing door; the outlet Install the water supply and drainage system between the outfitting room and the external water body; The outdoor part includes a starting section tunnel and a slope protection that are sequentially connected to the front port of the connecting section tunnel; the front end of the starting section tunnel is docked with the rear end of the floating tunnel pipe section, and the starting section tunnel is connected to the connecting section tunnel. Steel seal doors are installed at the joints and the joints between the initial tunnel and the suspension tunnel pipe joints; the two ends of the suspension tunnel pipe joints are sealed with steel seal doors; A pair of rails are installed on the top surface of the connecting section tunnel and the top surface of the starting section tunnel, and the pair of rails correspond to the pair of rails set on the top surface of the floating tunnel pipe section; the outfitting A pair of track groove sealing devices corresponding to a pair of tracks are arranged at the bottom of the outlet of the chamber. 3. The construction method for underwater installation of the anchored floating tunnel according to claim 2, wherein the sealing door at the inlet is a steel plate structure; the sealing door at the outlet is a reinforced concrete caisson with multiple compartments structure; the outlet-end airtight door is composed of the bottom plate and the surrounding side walls to form the caisson shell, and the inside of the caisson shell is divided into multiple compartments by several transverse partition walls and several longitudinal partition walls. Through holes, each through hole is equipped with a connecting valve; the top elevation of the outlet-end sealing door is 2-3m higher than the highest water level + wave height + surplus height of the external water body, and the width of the outlet-end sealing door is the outfitting room The width of the outlet must be at least 8m, and the thickness of the airtight door at the outlet must meet the requirements for installation, removal and stability of the base. 4. The construction method for underwater installation of an anchored floating tunnel section by section according to claim 2, wherein the track groove sealing device includes a steel shell accommodating the track, a pair of hydraulic jacks and a pair of steel pistons head; the steel shell is embedded in the water-facing side wall; a pair of hydraulic jacks are installed horizontally and symmetrically on both sides of the steel shell; a pair of steel piston heads are symmetrically installed on the pistons of a pair of hydraulic jacks On the rod, the front end faces of a pair of steel piston heads are provided with a mold cavity matching the side shape of the track, and rubber waterstop strips are arranged on the surface of the mold cavity. 5. The construction method for underwater installation of an anchored floating tunnel section by section according to claim 1, wherein the installation trolley includes a vehicle frame, a front outrigger, a rear outrigger, a front pontoon and a rear pontoon ;in, The vehicle frame is a planar truss structure and includes a pair of longitudinal beams, front beams and rear beams; track grooves are provided on the bottom surfaces of the middle and front parts of the pair of longitudinal beams; The front outrigger is U-shaped and the top is provided with a pair of top rollers, and the bottom of the front outrigger is provided with a pair of front bottom rollers with driving device, so that the front outriggers are reversed one by one through the pair of top rollers. The track grooves on the bottom surface of a pair of longitudinal beams of the vehicle frame, and the front legs are snapped onto the pair of tracks one by one through a pair of front bottom rollers; The rear outriggers are fixed on the rear of a pair of longitudinal beams of the vehicle frame, and the bottom of the rear outriggers is provided with two pairs of rear bottom rollers with driving devices, so that the rear outriggers pass through the two pairs of rear bottom rollers one by one. Correspondingly clamped on a pair of rails; The front pontoon is fixed on the front part of the vehicle frame, and a buoyant weight ratio adjustment system is arranged in the front pontoon, and a pair of the front pipe joint sinking and unloading winches and a pair of trolley mooring winches are also installed on the front. inside the pontoon; The rear pontoon is fixed on the rear of the vehicle frame, and a buoyant weight ratio adjustment system is arranged in the rear pontoon, and a pair of hoists for sinking and releasing the rear pipe joints are also installed in the rear pontoon. 6. The construction method for underwater installation of the anchored floating tunnel joint by joint according to claim 5, wherein the rear legs of the installation trolley comprise two plane trusses arranged in parallel, and each plane truss comprises The front column, the rear column and a lower longitudinal beam, two bottom rollers with driving devices are respectively installed on the bottom surface of the lower longitudinal beam of the two plane trusses, and the front column and the rear column of the two plane trusses are in one-to-one correspondence It is fixed on the rear bottom surface of a pair of longitudinal beams of the vehicle frame. 7. The construction method for underwater section-by-section installation of anchored floating tunnels according to claim 5, characterized in that an operating room and an oxygen supply device are also provided in the rear buoyancy tank of the installation trolley. 8. The construction method for underwater section-by-section installation of anchored floating tunnels according to claim 1, wherein the temporary mooring pier is a deep-water jacket + anchor cable structure.

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